# 小塘管 vs PDF Tools

The clearest difference is in-app purchases: 小塘管 at none against PDF Tools's 2. 小塘管 also leads on ads (none vs shown) and update cadence (every 4 weeks vs every 5 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. PDF Tools sells 2 in-app purchases, starting at $2.99 per 7 days. 小塘管 asks for nothing beyond the download.

小塘管 ships an update every 4 weeks, PDF Tools every 5 months. The most recent releases landed on October 17, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | 小塘管 | PDF Tools |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 4 weeks** | Every 5 months |
| Size | 21 MB | 5 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [琪卿 罗](https://appshunter.io/developer/1509216807) | [云峰 林](https://appshunter.io/developer/1740866485) |

## What reviewers say

### 小塘管

[App page](https://appshunter.io/ios/app/id1589632727)

**Features:** macOS Compatibility

**In-app purchases:** none


### PDF Tools

[App page](https://appshunter.io/ios/app/pdf-tools-merge-split-edit/id6738097501)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDF Assistant Weekly VIP+Trial | $2.99 | per 7 days |
| PDF Assistant Permanent VIP | $3.99 | one-time |


## Frequently asked questions

### Is 小塘管 free?

小塘管 is free to download, with no in-app purchases.

### Is PDF Tools free?

PDF Tools is free to download, with in-app purchases available.

### Do 小塘管 or PDF Tools have ads?

PDF Tools shows ads; 小塘管 does not.

### Which is updated more often, 小塘管 or PDF Tools?

小塘管 ships an update every 4 weeks, and PDF Tools every 5 months. Most recently, 小塘管 was updated on October 17, 2026 and PDF Tools on October 1, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*